I adore using some of these stamps for color swatching and color combos.
Making backgrounds or background elements with these is also great.
I plan on Zentangling inside some of the larger outline shapes.
Stamping several strips or blocks of colors to help ground our accent something else, is a great use. Shadow/ pale colorblcking too.
Borders and things that help move your eye through the design.
Simple pixel patterns. Anything more than really small Pixel designs and I prefer using a stencil, but once I have a die cut machine using the dies to do so will be easier.
A variety of geometric patterns and designs, such as building a chevron ombre pattern with the rectangles.
I wish there wwas a stencil set for these as that would increase my options. Once I can die cut, I can stencil with those, but the outline stamps I would use with that sometimes, would be smaller than the die cut opening. I still have a ton of ideas, and coming up with more all the time, like stamping a simple bar graph of love, or something, for Valentines Day.